The SARS-CoV-2 pandemic has led to a global decrease in personal protective equipment (PPE), especially filtering facepiece respirators (FFRs). Ultraviolet-C wavelength is a promising way of decontamination, however adequate dosimetry is needed to ensure balance between over and underexposed areas and provide reliable results. Our study demonstrates that UVGI light irradiance varies significantly on different respirator angles and propose a method to decontaminate several masks at once ensuring appropriate dosage in shaded zones. An UVGI irradiator was built with internal dimensions of 69.5 × 55 × 33 cm with three 15 W UV lamps. Inside, a grating of 58 × 41 × 15 cm was placed to hold the masks. Two different flat fold respirator models were used to assess irradiance, four of model Aura 9322 3 M of dimensions 17 × 9 × 4 cm (tri-fold), and two of model SAFE 231FFP3NR (bi-fold) with dimensions 17 × 6 × 5 cm. An STN-SilverNova spectrometer was employed to verify wavelength spectrum and surface irradiance. A simulation was performed to find the irradiance pattern inside the box and the six masks placed inside. These simulations were carried out using the software DIALUX EVO 8.2. The data obtained reveal that the irradiance received inside the manufactured UVGI-irradiator depends not only on the distance between the lamps' plane and the base of the respirators but also on the orientation and shape of the masks. This point becomes relevant to assure that all the respirators inside the chamber receive the correct dosage. Irradiance over FFR surfaces depend on several factors such as distance and angle of incidence of the light source. Careful irradiance measurement and simulation can ensure reliable dosage in the whole mask surface, balancing overexposure. Closed box systems might provide a more reliable, reproducible UVGI dosage than open settings.

SARS-CoV-2大流行导致个人防护设备（PPE），尤其是过滤式口罩呼吸器（FFR）的全球减少。紫外线C波长是一种有希望的去污方法，但是需要足够的剂量测定法来确保曝光过度和曝光不足区域之间的平衡并提供可靠的结果。我们的研究表明，UVGI光的辐照度在不同的呼吸器角度上有显着差异，并提出了一种对多个口罩进行净化处理的方法，以确保在阴影区域使用适当的剂量。使用三个15 W紫外线灯构建了一个UVGI辐射器，内部尺寸为69.5×55×33 cm。在内部，放置58×41×15 cm的光栅以固定掩模。使用了两种不同的扁平折叠呼吸器模型来评估辐照度，其中四种是尺寸为17×9×4 cm（三折）的Aura 9322 3 M型呼吸器，和两个SAFE 231FFP3NR型（对折），尺寸为17×6×5 cm。使用STN-SilverNova光谱仪验证波长光谱和表面辐照度。进行了仿真，以找到盒子内部的辐照度图案以及内部放置的六个掩模。使用软件DIALUX EVO 8.2进行了这些模拟。获得的数据表明，制造的UVGI辐照器内部接收到的辐照度不仅取决于灯的平面与呼吸器底部之间的距离，还取决于面罩的方向和形状。这一点对于确保腔室内的所有呼吸器都接收正确的剂量至关重要。FFR表面的辐照度取决于几个因素，例如光源的距离和入射角。仔细的辐照度测量和模拟可以确保整个面罩表面的剂量可靠，从而平衡了过度曝光。与开放设置相比，封闭盒系统可能提供更可靠，可重现的UVGI剂量。